<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/bmi">
    <input type="text" name="tall" placeholder="请输入你的身高">
    <input type="text" name="weight" placeholder="请输入你的体重">
    <input type="submit" value="测试">
</form>
</body>
</html>